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Audio-video-coding-standard (AVS)-based intra-frame prediction method

A technology for intra-frame prediction and pixel prediction, which is used in television, electrical components, image communication, etc., and can solve problems such as insufficient consideration of encoded image texture direction information.

Inactive Publication Date: 2011-09-14
WUHAN UNIV
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Problems solved by technology

This method only adds a small amount of computational complexity, but does not fully consider the rich texture direction information of the encoded image

Method used

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Embodiment

[0048] An AVS-based intra-frame prediction method. The AVS standard adopts the transform and quantization technology based on 8×8 sub-blocks. The minimum processing unit in the AVS standard is 8×8 sub-blocks, and the upper macroblocks are respectively defined for 8×8 sub-blocks. , the left macroblock, the upper left macroblock, the sub-block UL, the sub-block UR, the sub-block BL, the sub-block BR; and define the coded pixels in the upper macroblock adjacent to the current coding block as H(i), ( i=0,1,...,n), the decoded pixel in the left macroblock adjacent to the current coding block is V(i), (i=0,1,...,n), and the current The decoded pixel in the upper left macroblock adjacent to the coded block is P 0 , the 8 decoded pixels of the adjacent positions of the BR sub-block and the UR sub-block to be encoded are (a, b, ..., h), and the 16 pixels of the adjacent positions of the BR and UR sub-blocks and the BL sub-block to be encoded A decoded pixel is (a 0 , b 0 ,...,o 0 ,...

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Abstract

The invention discloses a novel audio-video-coding-standard (AVS)-based two-way intra-frame prediction method. In the novel two-way intra-frame prediction method, the weighted sum of pixel values calculated by any two intra-frame prediction modes in an AVS is calculated to obtain final two-way intra-frame predicted pixel values. The method comprises the following steps of: first adding a reverse scanning sequence on the basis of AVS raster scanning; then adding the intra-frame prediction modes corresponding to reverse scanning, and calculating the weighted sum of any two of the newly added intra-frame prediction modes corresponding to the reverse scanning to obtain the two-way intra-frame predicted pixel values corresponding to the reverse scanning; and finally selecting an optimal intra-frame prediction mode from all intra-frame prediction and two-way intra-frame prediction modes corresponding to the raster scanning and the reverse scanning by utilizing a sum of absolute errors (SAE)standard. By the novel two-way intra-frame prediction method provided by the invention, coding performance is further improved, and the shortcomings of relatively fewer intra-frame prediction modes and relatively lower prediction efficiency in the AVS are overcome.

Description

technical field [0001] The present invention relates to an intra-frame prediction method, in particular to an AVS-based intra-frame prediction method. Background technique [0002] AVS (Audio Video coding Standard) is the first advanced audio and video codec technology standard independently formulated by my country. AVS1-P2 is the video part of the AVS standard. It was officially approved as a national standard in 2006. The main technologies of the AVS1-P2 standard to improve coding efficiency include: 8×8 integer transformation, quantization, intra-frame prediction, and 1 / 4-precision pixel interpolation , inter-frame prediction motion compensation, entropy coding, deblocking in-loop filtering, etc. Intra prediction uses the decoded pixels in the adjacent blocks of the current coding block to predict each pixel of the current coding block, so as to eliminate the redundancy in the image space, and is one of the most important technical means to improve the coding efficiency...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/26H04N7/32H04N19/11H04N19/159H04N19/593
Inventor 胡瑞敏钟睿苏妮王中元侯志强渠慎明胡金晖黄震坤
Owner WUHAN UNIV
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